let’s talk chemistry!. 1. the atom basic unit of matter made up of protons, neutrons and...

Let’s Talk Chemistry!

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Let’s Talk Chemistry!

1. The Atom

basic unit of matter made up of protons, neutrons and

electrons the atom is neutrally charged (no charge)

Helium Atom: Atomic Number 2

Electron

Proton

Neutron

2. Structure of an atom2. Structure of an atom

The nucleus of an atom:The nucleus of an atom: Protons are positively charged

Neutrons have no charge

Electrons: in constant motion around nucleus negatively charged

Atoms have an equal number of Atoms have an equal number of protons and electrons.protons and electrons.

Page 4: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

3. Elements3. ElementsPure substancePure substanceMade of one type of atomMade of one type of atomRepresented by 1, 2 or 3 lettersRepresented by 1, 2 or 3 letters

Page 5: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

4. History of the Periodic Table4. History of the Periodic Table

Mendeleev designed the first periodic table

He arranged the elements by increasing atomic mass

He left blank spaces according to similarities in columns of elements

Page 6: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

More history…More history…

Mendeleev’s blank spaces (or predictions) were elements that he claimed were not discovered yet.

As it turns out, he was right!!

Scientists later discovered the missing elements with the properties that Mendeleev predicted!

Page 7: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

And even more history!And even more history!Moseley discovered the atomic

number

He organized the periodic table by increasing atomic number

This allowed for elements with similar properties to fall into place

An gave way to the modern periodic table

Page 8: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

5. Molecules5. Molecules

Smallest unit (part) of a compound Hydrogen molecule

Water

http://bio.winona.edu/berg/ANIMTNS/hydrgnan.gif

Page 9: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

6. Compounds6. Compounds a substance that contains two or

more different elements

organic compounds must contain Carbon

Acetic acid

Page 10: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

7. Molecular formulaMolecular formula

Shows how many atoms of each Shows how many atoms of each

element a molecule containselement a molecule contains

Does not tell you about a molecule’s Does not tell you about a molecule’s structurestructure

Page 11: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

Examples of molecular Examples of molecular formulasformulas

HH22OO 2 hydrogen2 hydrogen1 oxygen1 oxygen

NHNH33 1 nitrogen1 nitrogen3 hydrogen3 hydrogen

CC66HH1212OO6 6 6 carbon6 carbon12 hydrogen12 hydrogen6 oxygen6 oxygen

Page 12: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

8. Structural formula8. Structural formula

Shows how atoms are arranged in a Shows how atoms are arranged in a moleculemolecule

2-dimensional representation of a 2-dimensional representation of a molecule’s structuremolecule’s structure

Page 13: Let’s Talk Chemistry!. 1. The Atom basic unit of matter made up of protons, neutrons and electrons the atom is neutrally charged (no charge) Helium

9. 3-D model9. 3-D model

Shows how the atoms are arranged in a molecule

Is able to be moved or turned, allowing you to view the molecule from different angles

3D model

http://www.classzone.com/books/earth_science/terc/content/visualizations/es0503/es0503page01.cfm?chapter_no=visualization

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